Incandescent bulbs are designed keeping in mind that the resistance of their filament increases with the increase in temperature. If at the room temperature 
and 40 W bulbs have filament resistances 
, R60 and 
respectively, then the relation between these resistances is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
We know that 
For a given potential difference at a particular temperature.
It is given that the powers of the bulbs are in the order
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